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something_edit_field.cpp
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244 lines (214 loc) · 7.55 KB
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#include "something_edit_field.hpp"
void Edit_Field::render(SDL_Renderer *renderer, Bitmap_Font *font, Vec2f edit_field_position)
{
// EDIT FIELD
font->render(renderer, edit_field_position, vec2(CONSOLE_FONT_SIZE, CONSOLE_FONT_SIZE),
FONT_DEBUG_COLOR, String_View {edit_field_size, edit_field});
// CURSOR
const auto cursor_pos = cursor_position(edit_field_position);
{
RGBA cursor_color = FONT_DEBUG_COLOR;
const float blink_alpha = cosf(blink_angle * CONSOLE_BLINK_FREQUENCY) * 0.5f + 0.5f;
cursor_color.a = blink_alpha;
fill_rect(renderer,
rect(cursor_pos,
(float) (BITMAP_FONT_CHAR_WIDTH * CONSOLE_FONT_SIZE),
(float) (BITMAP_FONT_CHAR_HEIGHT * CONSOLE_FONT_SIZE)),
cursor_color);
if (edit_field_cursor < edit_field_size) {
RGBA overlay_text_color = CONSOLE_BACKGROUND_COLOR;
overlay_text_color.a = cursor_color.a;
font->render(renderer, cursor_pos, vec2(CONSOLE_FONT_SIZE, CONSOLE_FONT_SIZE),
overlay_text_color, String_View {1, edit_field + edit_field_cursor});
}
}
// SELECTION
// text: the q[uick bro]w[n fox jump]s over the lazy dog
// cursor: ^
// selection_begin: ^ ^
{
auto selection = get_selection();
if (!selection.is_empty()) {
const float begin_x = (float) selection.begin * BITMAP_FONT_CHAR_WIDTH * CONSOLE_FONT_SIZE + edit_field_position.x;
const float end_x = (float) selection.end * BITMAP_FONT_CHAR_WIDTH * CONSOLE_FONT_SIZE + edit_field_position.x;
const float width = end_x - begin_x;
fill_rect(renderer,
rect(vec2(begin_x, edit_field_position.y),
width,
(float) (BITMAP_FONT_CHAR_HEIGHT * CONSOLE_FONT_SIZE)),
CONSOLE_SELECTION_COLOR);
font->render(renderer, vec2(begin_x, edit_field_position.y), vec2(CONSOLE_FONT_SIZE, CONSOLE_FONT_SIZE),
CONSOLE_BACKGROUND_COLOR,
String_View {selection.end - selection.begin, edit_field + selection.begin});
}
}
}
Vec2f Edit_Field::cursor_position(Vec2f edit_field_position)
{
const auto cursor_x = edit_field_cursor * BITMAP_FONT_CHAR_WIDTH * CONSOLE_FONT_SIZE + edit_field_position.x;
return {cursor_x, edit_field_position.y};
}
void Edit_Field::update(float dt)
{
blink_angle = fmodf(blink_angle + 2 * PI * dt, 2 * PI);
}
void Edit_Field::handle_event(SDL_Event *event)
{
blink_angle = 0.0;
switch (event->type) {
case SDL_KEYDOWN: {
switch (event->key.keysym.sym) {
case SDLK_DELETE: {
const auto selection = get_selection();
if (selection.is_empty()) {
delete_char();
} else {
delete_selection(selection);
}
} break;
case SDLK_BACKSPACE: {
const auto selection = get_selection();
if (selection.is_empty()) {
backspace_char();
} else {
delete_selection(selection);
}
} break;
case SDLK_LEFT: {
cursor_left(event->key.keysym.mod & KMOD_LSHIFT);
} break;
case SDLK_RIGHT: {
cursor_right(event->key.keysym.mod & KMOD_LSHIFT);
} break;
case SDLK_v: {
if (event->key.keysym.mod & KMOD_LCTRL) {
insert_cstr(sec(SDL_GetClipboardText()));
}
} break;
case SDLK_c: {
if (event->key.keysym.mod & KMOD_LCTRL) {
auto selection = get_selection();
if (!selection.is_empty()) {
memcpy(clipboard_buffer, edit_field + selection.begin, selection.size());
clipboard_buffer[selection.size()] = '\0';
sec(SDL_SetClipboardText(clipboard_buffer));
}
}
} break;
}
} break;
case SDL_TEXTINPUT: {
if (!(SDL_GetModState() & KMOD_LCTRL)) {
insert_cstr(event->text.text);
}
} break;
}
}
Edit_Field::Selection Edit_Field::get_selection() const
{
Selection result = {};
if (edit_field_selection_begin <= edit_field_cursor) {
result.begin = edit_field_selection_begin;
result.end = edit_field_cursor;
} else {
result.begin = edit_field_cursor + 1;
result.end = edit_field_selection_begin + 1;
}
assert(result.begin <= result.end);
return result;
}
void Edit_Field::cursor_left(bool selection)
{
if (edit_field_cursor > 0) {
edit_field_cursor -= 1;
if (!selection) {
edit_field_selection_begin = edit_field_cursor;
}
}
}
void Edit_Field::cursor_right(bool selection)
{
if (edit_field_cursor < edit_field_size) {
edit_field_cursor += 1;
if (!selection) {
edit_field_selection_begin = edit_field_cursor;
}
}
}
void Edit_Field::insert_sv(String_View sv)
{
const size_t remaining = CONSOLE_COLUMNS - edit_field_size;
const size_t n = min(sv.count, remaining);
memmove(edit_field + edit_field_cursor + n,
edit_field + edit_field_cursor,
edit_field_size - edit_field_cursor);
memcpy(edit_field + edit_field_cursor, sv.data, n);
edit_field_cursor += n;
edit_field_selection_begin = edit_field_cursor;
edit_field_size += n;
}
void Edit_Field::insert_cstr(const char *cstr)
{
const size_t remaining = CONSOLE_COLUMNS - edit_field_size;
const size_t n = min(strlen(cstr), remaining);
memmove(edit_field + edit_field_cursor + n,
edit_field + edit_field_cursor,
edit_field_size - edit_field_cursor);
memcpy(edit_field + edit_field_cursor, cstr, n);
edit_field_cursor += n;
edit_field_selection_begin = edit_field_cursor;
edit_field_size += n;
}
void Edit_Field::delete_selection(Selection selection)
{
assert(selection.begin < edit_field_size);
assert(selection.end <= edit_field_size);
memmove(edit_field + selection.begin,
edit_field + selection.end,
edit_field_size - selection.end);
edit_field_cursor = selection.begin;
edit_field_size -= selection.size();
edit_field_selection_begin = edit_field_cursor;
}
void Edit_Field::delete_char()
{
if (edit_field_cursor < edit_field_size) {
const size_t n = edit_field_size - edit_field_cursor - 1;
memmove(
edit_field + edit_field_cursor,
edit_field + edit_field_cursor + 1,
n);
edit_field_size -= 1;
edit_field_selection_begin = edit_field_cursor;
}
}
void Edit_Field::backspace_char()
{
if (edit_field_cursor > 0) {
const size_t n = edit_field_size - edit_field_cursor;
memmove(
edit_field + edit_field_cursor - 1,
edit_field + edit_field_cursor,
n);
edit_field_cursor -= 1;
edit_field_size -= 1;
edit_field_selection_begin = edit_field_cursor;
}
}
String_View Edit_Field::as_string_view()
{
return String_View {edit_field_size, edit_field};
}
void Edit_Field::clean()
{
edit_field_size = 0;
edit_field_cursor = 0;
edit_field_selection_begin = 0;
}
void Edit_Field::copy_from_string_view(String_View s)
{
memcpy(edit_field, s.data, s.count);
edit_field_size = s.count;
edit_field_cursor = s.count;
edit_field_selection_begin = edit_field_cursor;
}